Humidity detector



FIG. 1 is a right side elevation of a humidity detector showing my newdesign;

FIG. 2 is a front elevational view;

FIG. 3 is a left side elevational view;

FIG. 4 is a rear elevational view;

FIG. 5 is a top plan view; and

FIG. 6 is a bottom plan view thereof.

The ornamental design for a humidity detector, as shown and described.